Blue Line 57.8mm GY6 Crankshaft Assembly - 125/150cc

This Blue Line complete crankshaft helps bring your compatible GY6 engine back to dependable running with a replacement rotating assembly for your rebuild. The 57.8mm-stroke assembly includes the connecting rod and main bearings, with threaded shaft ends and a 19-spline drive end for the matching engine configuration.

Key Features

• Complete crankshaft assembly: Includes the connecting rod and main bearings to simplify your bottom-end rebuild.
• 57.8mm stroke: Replacement configuration for compatible GY6 125cc/150cc engines and the matching applications below.
• 19-spline drive end: Matches the corresponding drive components on a compatible engine.
• Threaded shaft ends: M12 × 1.25 flywheel and drive-end threads, each with 14mm thread length.
• Aftermarket replacement: Blue Line offers an alternative when the original crankshaft needs replacement.

Technical Specifications

• Brand: Blue Line
• Part number: 1100-1190
• Part type: Complete crankshaft assembly
• Classification: Aftermarket replacement
• Stroke: 57.8mm
• Overall length: 285mm
• Flywheel thread: M12 × 1.25
• Flywheel thread length: 14mm
• Drive-end thread: M12 × 1.25
• Drive-end thread length: 14mm
• Connecting-rod small-end bore / piston-pin hole: 15mm
• Drive-end splines: 19
• Included: Crankshaft, connecting rod and main bearings
• Sold separately: Piston, piston pin and circlips

Compatibility

For compatible GY6 125cc/150cc scooter engines and matching 157QMJ-based 125cc/150cc/169cc applications using the following engine codes.

Check the engine code stamped on your crankcase and compare the 57.8mm stroke, 285mm overall length, 15mm small-end bore, 19-spline drive end and shaft threads with your original crankshaft before ordering. The letters QM or FM alone do not establish a matching crankshaft configuration.

The piston, pin and circlips are sold separately. A GY6 150cc piston set is available separately; match it to your cylinder bore and engine configuration.

• Complete crankshaft with connecting rod and main bearings
• 57.8mm stroke and 285mm overall length
• 19-spline drive end
• 15mm connecting-rod small-end bore
• M12 × 1.25 threads at both shaft ends
• Blue Line aftermarket replacement

Brand: Blue Line; Part number: 1100-1190; Aftermarket replacement; Stroke: 57.8mm; Overall length: 285mm; Flywheel thread: M12 × 1.25, 14mm long; Drive-end thread: M12 × 1.25, 14mm long; Small-end bore: 15mm; Drive splines: 19; Includes connecting rod and main bearings; Piston, pin and circlips sold separately

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